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Intrathecal sufentanil dose response in nulliparous patients
V A Arkoosh1, M Cooper, M C Norris
1Thomas Jefferson University Hospital, Allegheny University of the Health Sciences, Philadelphia, Pennsylvania, USA. varkoosh@gte.net
Anesthesiology
|August 26, 1998
Summary
The effective dose of intrathecal sufentanil for 50% of nulliparous patients during labor was determined to be 1.8 micrograms. This study provides crucial data for optimizing labor analgesia with spinal opioids.
Area of Science:
- Anesthesiology
- Obstetrics
- Pharmacology
Background:
- Intrathecal sufentanil is effective for labor analgesia.
- Previous studies reported various effective doses.
- This study aimed to find the ED50 for nulliparous patients.
Purpose of the Study:
- Determine the effective dose (ED50) of intrathecal sufentanil for 50% of nulliparous patients requesting labor analgesia.
- Establish a precise dose for effective pain relief during the first stage of labor.
Main Methods:
- Prospective, randomized, double-blinded study of 50 nulliparous patients in spontaneous labor.
- Patients received varying doses of intrathecal sufentanil (1, 2, 3, 5, or 10 microg).
- ED50 was calculated using probit analysis based on requests for additional pain medicine.
Main Results:
- The ED50 of intrathecal sufentanil was determined to be 1.8 microg (SE, 0.6 microg).
- Demographics were similar across all dose groups.
- The incidence of side effects was comparable among the groups.
Conclusions:
- This is the first study to establish the ED50 of intrathecal sufentanil in nulliparous patients during spontaneous labor.
- Findings provide a basis for future research on equianalgesic doses and combinations of labor analgesics.
- The determined ED50 aids in refining spinal opioid analgesia protocols for labor.